CN110445712B - Data forwarding method, device and system - Google Patents
Data forwarding method, device and system Download PDFInfo
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- CN110445712B CN110445712B CN201910646878.5A CN201910646878A CN110445712B CN 110445712 B CN110445712 B CN 110445712B CN 201910646878 A CN201910646878 A CN 201910646878A CN 110445712 B CN110445712 B CN 110445712B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/22—Alternate routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/302—Route determination based on requested QoS
- H04L45/308—Route determination based on user's profile, e.g. premium users
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
Abstract
The application provides a data forwarding method, a device and a system, in a scene with main and standby user access devices, the main user access device sends a main state indication message to a core network forwarding device, so that the core network forwarding device can identify the main user access device corresponding to the user device, and the core network forwarding device can correctly forward downlink data to the main user access device when forwarding the downlink data, thereby ensuring that the downlink data can be smoothly sent to the user device.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a data forwarding method, apparatus, and system.
Background
In some communication scenarios, wired communication cannot be conveniently performed between the user equipment and the server, for example, communication between a mobile vehicle (such as a subway, a high-speed rail, and the like) and a premise control center, communication between an offshore drilling platform and a terrestrial control center, and therefore communication between the user equipment and the server needs to be implemented by means of Long Term Evolution (LTE) wireless communication technology.
At this time, a user Access device, such as a user terminal device (CPE), a Train Access Unit (TAU), etc., is usually installed at a user side, the user device is connected to the user Access device, the server is accessed to a Long Term Evolution (LTE) core network through a service-side switch, the core network is connected to the base station, and data interaction between the user device and the server is realized through LTE wireless communication between the user Access device and the base station.
In order to improve the reliability and stability of communication between the user equipment and the server, a plurality of user access devices may be set in the same user area (such as a train or the same offshore drilling platform), the plurality of user access devices configure a primary-standby relationship at one side of the user side device through a Virtual Router Redundancy Protocol (VRRP), and the user equipment in the same user area is accessed to the user access device through a wired IP network. Data interaction between the user equipment and the server is usually realized through the primary user access equipment, and when the primary user access equipment fails, the data interaction is automatically switched to the data interaction between the user equipment and the server through the original standby user access equipment switched to the primary user access equipment.
Disclosure of Invention
In a first aspect, the present application provides a data forwarding method applied to a core network forwarding device, where the core network forwarding device wirelessly communicates with a user access device through a base station, and the core network forwarding device prestores a corresponding relationship between the user devices and the user access devices, where each user device accesses at least two user access devices, the method including:
receiving a main state indication message sent by user access equipment;
searching a target user device corresponding to the user access device which sends the main state indication message, and identifying the user access device which sends the main state indication message as the main user access device of the target user device;
receiving downlink data sent to the target user equipment, and sending the downlink data to a main user access device of the target user equipment so as to send the downlink data to the target user equipment through the main user access device.
Optionally, in the above method, the correspondence between the user equipment and the user access equipment is recorded in a reverse routing table of the core network forwarding device, and the reverse routing table records the correspondence between the user equipment and addresses of at least two user access devices accessed by the user equipment and forwarding priorities of the addresses of the at least two user access devices, where the highest forwarding priority is an active user access device;
the step of searching for a target user equipment corresponding to the user access equipment sending the primary state indication message and identifying the user access equipment sending the primary state indication message as the primary user access equipment of the target user equipment includes:
searching the address of the corresponding target user equipment in the reverse routing table according to the address of the user access equipment which sends the main state indication message;
identifying the address of the user access equipment which sends the main state indication message as the highest forwarding priority in the addresses of at least two user access equipment corresponding to the address of each target user equipment;
the step of sending the downlink data to the active user access device of the target user device includes:
and searching the address of the user access equipment with the highest forwarding priority corresponding to the target user equipment, and forwarding the downlink data to the corresponding user access equipment according to the searched address.
Optionally, in the above method, the core network forwarding device performs wireless communication based on a long term evolution technology with a user access device through a base station, and the user access device performs wired communication based on an internet protocol with the user device.
Optionally, in the above method, the core network forwarding device is a public data network gateway in an LTE core network.
In a second aspect, the present application provides a data forwarding method, which is applied to a data forwarding system including a user access device and a core network forwarding device, where the core network forwarding device prestores a corresponding relationship between the user device and the user access device, and each user device is accessed to at least two user access devices; the method comprises the following steps:
the user access equipment detects the main-standby relationship between the user access equipment and other user access equipment in the same user area;
when the user access equipment detects that the equipment is the main user access equipment, the user access equipment sends a main state indication message to core network forwarding equipment;
the core network forwarding equipment searches for a target user equipment corresponding to the user access equipment which sends the main state indication message, and identifies the user access equipment which sends the main state indication message as the main user access equipment of the target user equipment;
the core network forwarding device receives downlink data sent to the target user equipment, searches for a main user access device corresponding to the target user equipment according to the address of the target user equipment, and sends the downlink data to the main user access device so as to send the downlink data to the target user equipment through the main user access device.
In a third aspect, the present application provides a data forwarding apparatus, which is applied to a core network forwarding device, where the core network forwarding device wirelessly communicates with a user access device through a base station, and the apparatus includes:
the reverse routing relation module is used for recording the corresponding relation between the user equipment and the user access equipment, wherein each user equipment is accessed to at least two user access equipment;
the information receiving module is used for receiving a main state indication message sent by the user access equipment;
a state identification module, configured to search for a target ue corresponding to a ue that sends the primary state indication message, and identify the ue that sends the primary state indication message as a primary ue of the target ue;
a data sending module, configured to receive downlink data sent to the target user equipment, search, according to the address of the target user equipment, for a primary user access device corresponding to the target user equipment, and send the downlink data to the primary user access device, so as to send the downlink data to the target user equipment through the primary user access device.
Optionally, in the above apparatus, the correspondence between the ue and the ue is recorded in a reverse routing table of the core network forwarding device, where the reverse routing table records the correspondence between the ue and addresses of at least two ues accessed by the ue, and forwarding priorities of the addresses of the at least two ues accessed by the ue;
the state identification module is specifically configured to search, according to the address of the user access device that sends the active state indication message, the address of the corresponding target user device in the reverse routing table; identifying the address of the user access equipment which sends the main state indication message as the main user access equipment with the highest forwarding priority in the addresses of at least two user access equipments corresponding to the address of the target user equipment;
the data sending module is specifically configured to search for an address of a user access device with the highest forwarding priority corresponding to each target user device, and forward the downlink data to the corresponding user access device according to the searched address.
Optionally, in the above apparatus, the core network forwarding device performs wireless communication based on an LTE technology with the user access device through a base station.
Optionally, in the above apparatus, the core network forwarding device is a public data network gateway in an LTE core network.
In a fourth aspect, the present application provides a data forwarding system, including a user access device and a core network forwarding device, where the core network forwarding device prestores a corresponding relationship between the user devices and the user access device, and each user device is accessed to at least two user access devices;
the user access device is used for detecting the main-standby relationship between the user access device and other user access devices in the same user area, and sending a main state indication message to the core network forwarding device when detecting that the device is a main user access device;
the core network forwarding device is used for searching a target user device corresponding to the user access device which sends the main state indication message, and identifying the user access device which sends the main state indication message as a main user access device of the target user device; receiving downlink data to be sent to the target user equipment, searching for the main user access equipment corresponding to the target user equipment according to the address of the target user equipment, and sending the downlink data to the main user access equipment so as to send the downlink data to the target user equipment through the main user access equipment.
In a scenario where there are active and standby user access devices, the method, the apparatus, and the system according to the embodiments of the present application send an active state indication message to the core network forwarding device through the active user access device, so that the core network forwarding device can identify the active user access device corresponding to the user device, and thus when forwarding downlink data, the core network forwarding device can correctly forward the downlink data to the active user access device, thereby ensuring that the downlink data can be smoothly sent to the user device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic diagram of a data forwarding system provided in an embodiment of the present application;
fig. 2 is a schematic flowchart of a data forwarding method according to an embodiment of the present application;
fig. 3 is a second schematic flowchart of a data forwarding method according to an embodiment of the present application;
fig. 4 is a third schematic flowchart of a data forwarding system according to an embodiment of the present application;
fig. 5 is a schematic functional module diagram of a first data forwarding apparatus according to an embodiment of the present application;
fig. 6 is a schematic diagram of a core network forwarding device provided in an embodiment of the present application;
fig. 7 is a schematic functional module diagram of a second data forwarding apparatus according to an embodiment of the present application;
fig. 8 is a schematic diagram of a user access device according to an embodiment of the present application.
Icon: 100-core network forwarding devices; 510-a first data forwarding device; 511-reverse routing relation module; 512-an information receiving module; 513-a state identification module; 514-data sending module; 620-a first machine-readable storage medium; 610-a first processor; 200(200A, 200B) -user access equipment; 710-a second data forwarding device; 711-state detection module; 712-a status notification module; 820-a second machine-readable storage medium; 810-a second processor; 300-a user equipment; 400-user side switch; 500-a base station; 600-server.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In one example, in order to improve reliability and stability of data transmission between the user equipment and the server, a plurality of user access devices may be set in a user area, and the user equipment accesses the plurality of user access devices through a user-side switch and performs wired communication based on Internet Protocol (IP) with the user access devices. The user area can be a specific area of the user side which adopts wired communication network communication, such as the same offshore oil well platform in the same mobile carrier.
A plurality of user access devices configure a master-slave relationship on one side of the user device through a VRRP protocol, usually, one master user access device performs wireless communication with a base station, and other user access devices are in a standby state. When the main user access equipment fails, the method automatically switches to the original standby user access equipment switched to the main user access equipment to realize data interaction between the user equipment and the server.
For example, referring to fig. 1, taking a communication scenario between a mobile carrier and a premise server as an example, the data forwarding system shown in fig. 1 may include a user equipment 300, at least two user access devices (such as 200A and 200B shown in fig. 1), and a core network forwarding device 100.
The user access device 200A and the user access device 200B may be respectively disposed at the front and the rear of a mobile vehicle, and the mobile vehicle in this embodiment may be a rail transportation vehicle (such as a subway, a light rail train, and a high-speed train), an automobile, a ship, and the like.
The ue 300 is connected to the user-side switch 400, and the user-side switch 400 is further connected to the ue installed at the front and the rear of the mobile vehicle, respectively. The user device 300 may be an electronic device disposed on a mobile vehicle, such as a Passenger Information System (PIS) device mounted on a rail transit vehicle.
The server 600 and the base station 500 are connected to a core network, and the core network relay device 100 in the core network can perform wireless communication with the user access device (200A or 200B) through the base station 500. In this embodiment, the core Network forwarding device 100 may be a device having a Data forwarding function in an LTE core Network, such as a Public Data Network GateWay (PGW). The core network forwarding device 100 may perform wireless communication based on LTE-M (LTE Metro) technology with the user access device (200A or 200B) through the base station 500. The server 600 may be a device that requires data interaction with the user device 300, such as a PIS server.
Data interaction between the user equipment 300 and the server 600 is generally realized by one of the user access equipment, and when the user access equipment fails, data interaction between the user equipment 300 and the server 600 is switched to be realized by the other user access equipment.
In some scenarios, the server 600 may need to unicast the downstream data to a specific user device 300. For example, the user device 300 may be an in-vehicle PIS device, and the server 600 may be a PIS server that transmits PIS video data to a plurality of in-vehicle PIS devices by multicast. In order to improve the stability of video display, the vehicle-mounted PIS equipment can perform caching after receiving the video data and check whether the video has packet loss. If the vehicle-mounted PIS equipment detects that the video is lost, a packet supplementing request is sent to the PIS server through the main user access equipment, but after the PIS server receives the packet supplementing request, if the lost data packet is sent to the vehicle-mounted PIS equipment in a unicast mode, the core network cannot correctly send downlink data to the main user access equipment because the core network cannot know the main state and the standby state among the user access equipment, and then the downlink data cannot be smoothly forwarded to the user equipment.
Referring to fig. 2, fig. 2 is a schematic flowchart illustrating a flow of steps of a data forwarding method applied to the core network forwarding device 100 shown in fig. 1 according to this embodiment, and each step of the method is described in detail below.
Step S110, receiving the active state indication message sent by the user access device.
In this embodiment, after a plurality of user access devices in the same user area mutually negotiate to determine an active user access device, the active user access device may send active state indication information to the core network forwarding device.
For example, in the scenario shown in fig. 1, after the user access device 200A and the user access device 200B perform active/standby relationship negotiation and determine that the user access device 200A is an active user access device, the user access device 200A may send active state indication information to the core network forwarding device 100.
Step S120, searching for a target ue corresponding to the ue sending the active state indication message, and identifying the ue sending the active state indication message as an active ue of the target ue.
In this embodiment, the core network forwarding device 100 may prestore a corresponding relationship between the user equipment 300 and the user access devices, where each user equipment accesses at least two user access devices.
In the scenario shown in fig. 1, after receiving the active state indication information sent by the user access device 200A, the core network forwarding device 100 may find the user device 300 corresponding to the user access device 200A, and then identify the user access device 200A as an active user access device of the user device 300.
It should be noted that, since there may be multiple user equipments in the same user area, the multiple user equipments all communicate with the server through the user access equipment in the user area. Therefore, in the correspondence recorded by the core network forwarding device, the user access devices corresponding to the user devices in the same user area are the same. After the core network forwarding device receives the primary state indication message, it can find out a plurality of target user devices corresponding to the user access device sending the primary state indication message, and identify the user access device sending the primary state indication message as the primary user access device for each target user device.
Step S130, receiving the downlink data sent to the target user equipment, and sending the downlink data to the primary user access device of the target user equipment, so as to send the downlink data to the target user equipment through the primary user access device.
In this embodiment, when receiving downlink data that needs to be sent to a target user equipment, a core network forwarding device searches for an active user access device corresponding to the target user equipment, and sends the downlink data to the active user access device, so that the core network forwarding device forwards the downlink data to the target user equipment through the active user access device.
In the scenario shown in fig. 1, when receiving downlink data that needs to be sent to the user equipment 300, the core network forwarding device 100 may find an active user access device (i.e., the user access device 200A) currently corresponding to the user equipment 300, send the downlink data to the user access device 200A, and then the user access device 200A forwards the downlink data to the user equipment 300.
Based on the above design, in the data forwarding method provided in this embodiment, the active user access device sends the active state indication message to the core network forwarding device, so that the core network forwarding device can record the active user access device corresponding to the user device, and further, when forwarding the downlink data, the core network forwarding device can correctly forward the downlink data to the active user access device, thereby ensuring that the downlink data can be smoothly sent to the user device.
In one example, the core network forwarding device may be configured with a reverse routing table, where the reverse routing table records a correspondence relationship between each user equipment and an address of a user access device accessed by the user equipment, and forwarding priorities corresponding to the addresses of the at least two user access devices.
For example, if the communication address of one ue in the user area 1 is 192.168.0.1, the communication address of one ue is 192.168.0.2, and the uplink port addresses of two ues in the user area 1 are 10.0.10.1 and 10.0.10.2, respectively. Meanwhile, the communication address of one user equipment in the user area 2 is 192.168.0.3, and the uplink port addresses of two user access equipments in the user area 2 are 10.0.10.3 and 10.0.10.4, then the information recorded in the reverse routing table of the core network forwarding equipment may be as shown in table 1.
Table 1 reverse routing table example one
| User equipment IP address | User access device IP address | Forwarding priority |
| 192.168.0.1 | 10.0.10.1 | 0 |
| 192.168.0.1 | 10.0.10.2 | 0 |
| 192.168.0.2 | 10.0.10.1 | 0 |
| 192.168.0.2 | 10.0.10.2 | 0 |
| 192.168.0.3 | 10.0.10.3 | 0 |
| 192.168.0.3 | 10.0.10.4 | 0 |
| …… | …… | …… |
In this embodiment, the address correspondence between the user equipment and the user access equipment recorded in the reverse routing table may be statically configured in advance by an administrator according to a networking relationship, or may be automatically determined by the core network forwarding device through some interaction logic.
The initial values of the forwarding priorities of the multiple user access devices corresponding to the same user device in the reverse routing table may be configured to be the same, for example, in table 1, the initial values of the forwarding priorities of the user access devices in the reverse routing table are all 0.
In step S120, the core network forwarding device may search, according to the address of the user access device that sends the active state indication message, the address of the corresponding target user device in the reverse routing table.
Then, the core network forwarding device may identify, as the highest forwarding priority, the address of the user access device that sends the active state indication message, among the addresses of the at least two user access devices corresponding to the address of each target user device.
For example, if the source IP address of the active status message received by the core network forwarding device is 10.0.10.1, the addresses of the corresponding user equipment are found to be 192.168.0.1 and 192.168.0.2. Then, the core network forwarding device sets the forwarding priority of 10.0.10.1 to 1 with a higher priority and sets the forwarding priority of 10.0.10.2 to 0 with a lower priority in the addresses of the user access devices corresponding to 192.168.0.1 and 192.168.0.2, as shown in table 2.
Table 2 reverse routing table example two
| User equipment IP address | User access device IP address | Forwarding priority |
| 192.168.0.1 | 10.0.10.1 | 1 |
| 192.168.0.1 | 10.0.10.2 | 0 |
| 192.168.0.2 | 10.0.10.1 | 1 |
| 192.168.0.2 | 10.0.10.2 | 0 |
In step S130, when the core network forwarding device receives downlink data that needs to be sent to the target User equipment, it searches for an address of a User access device with the highest forwarding priority corresponding to the target User equipment according to a destination address of the downlink data (i.e., an address of the target User equipment), then searches for a TEID (Tunnel Endpoint Identifier) of a main User access device corresponding to the address and a transport layer IP address of a base station currently corresponding to the main User access device, adds a GTP-U (GPRS tunneling Protocol-User plane) Tunnel header to the IP address according to the TEID and the transport layer IP address of the base station, then sends the downlink data to the corresponding base station according to the transport layer IP address of the base station, and then the base station forwards the downlink data to the User access device corresponding to the TEID according to the TEID.
For example, when the core network forwarding device receives the downlink data with the destination address of 192.168.0.1, the reverse routing table is queried, if the address of the user access device with the highest forwarding priority is found to be 10.0.10.1, the TEID corresponding to 10.0.10.1 and the transport layer IP address of the base station currently corresponding to 10.0.10.1 are found, a GTP-U tunnel header is added according to the TEID and the transport layer IP address of the base station, then the transport layer IP address of the base station sends the downlink data to the corresponding base station, and then the base station forwards the downlink data to the user access device corresponding to 10.0.10.1 according to the TEID.
Based on the above design, in the data forwarding method provided in this embodiment, the core network forwarding device may record the corresponding relationship between the user equipment and the user access equipment through the reverse routing table, and configure the forwarding priority corresponding to the address of the user access equipment according to the active state indication message, so as to correctly forward the downlink data to the active user access equipment.
Referring to fig. 3, the present embodiment further provides a data forwarding method applied to the user access device shown in fig. 1, and each step of the method is described in detail below.
Step S210, detecting the primary-backup relationship between the user access device and other user access devices in the same user area.
Step S220, if the ue determines that the device is a master ue, then sends a master status indication message to the core network forwarding device, so that the core network forwarding device sends downlink data to the master ue when receiving the downlink data sent to the target ue in the user area.
In this embodiment, usually at least two user access devices in the same user area are connected to the same wired network, and the user access devices may perform a primary-secondary relationship negotiation with each other to determine a primary user access device. For example, the user access devices at the head and tail of the train start the VRRP, and after negotiation, the active user access device is determined.
In one example, the case that the ue detects that the ue is a primary ue, and then sends the primary status indication information includes:
after the main-standby relationship negotiation with other user access equipment, the user access equipment detects that the user access equipment is a main user access equipment, namely the main user access equipment sends main state indication information to the core network forwarding equipment;
when the user access device generates the master-slave relationship switching, the user access device detects that the user access device is switched from the standby user access device to a new master user access device, namely, the new master user access device sends master state indication information to the core network forwarding device, the core network forwarding device updates a reverse routing table according to the master state indication information, and identifies the address of the user access device which sends the master state indication information as the highest forwarding priority.
In one example, the active user access device may further send an active state indication message to the core network forwarding device at a fixed time, so that the core network forwarding device records the active/standby state of the user access device. Therefore, even if packet loss occurs in the indication information of the primary state sent by the primary user access device and the indication information of the primary state is not sent to the core network forwarding device after the negotiation of the primary-secondary relationship is completed or after the switching of the primary-secondary state, the indication information of the primary state sent at a subsequent timing can still inform the core network forwarding device 100 of the primary-secondary state.
To facilitate understanding of the solutions provided in the present embodiments by those skilled in the art, the following description is further provided with reference to an example.
In the scenario shown in fig. 1, when the user access device 200A accesses the LTE network, the IP address allocated by the core network to the user access device 200A is 10.0.10.1; when the user access device 200B accesses the LTE network, the core network allocates an IP address 10.0.10.2 to the user access device 200B; the address of the user equipment 300 is 192.168.0.1.
Referring to fig. 4, a reverse routing table is statically configured in the core network forwarding device 100, the reverse routing table records address corresponding relations between the user equipment 300 and the user access devices 200A and 200B, and initial values of forwarding priorities of the user access devices 200A and 200B in the reverse routing table are both 0.
The user access device 200A and the user access device 200B perform VRRP negotiation to determine that the user access device 200A is the active user access device. The user access device 200A sends the active state indication information to the core network forwarding device 100.
After receiving the active state indication information, the core network forwarding device 100 finds the address 192.168.0.1 of the user equipment 300 according to the address 10.0.10.1 of the user access equipment 200A that sent the active state indication information. Then, the core network forwarding device 100 performs an action of updating the reverse routing table, and in two user access devices corresponding to the address 192.168.0.1 of the user device 300, configures the forwarding priority corresponding to the address 10.0.10.1 of the user access device 200A to be 1 with a higher priority, and configures the forwarding priority corresponding to the address 10.0.10.2 of the user access device 200B to be 0.
When the core network forwarding device 100 receives the downlink data addressed to 192.168.0.1, the address of the user access device with the highest forwarding priority corresponding to 192.168.0.1 is searched in the reverse routing table. According to the query result, if the forwarding priority of the address 10.0.10.1 is the highest, the core network forwarding device 100 determines a corresponding TEID according to the address 10.0.10.1 and adds a corresponding GTPU tunnel header, then sends the downlink data packet to the user access device 200A corresponding to the address 10.0.10.1 according to the TEID, and then forwards the downlink data to the user device 300 by the user access device 200A.
After a period of time, if the user access device 200A fails, the user access device 200B is switched to the active user access device according to the VRRP mechanism, and then the user access device 200B sends the active state indication information to the core network forwarding device 100.
After receiving the active state indication information, the core network forwarding device 100 finds the address 192.168.0.1 of the user equipment 300 according to the address 10.0.10.2 of the user access equipment 200B that sent the active state indication information. Then, the core network forwarding device 100 performs an action of updating the reverse routing table, and in two user access devices corresponding to the address 192.168.0.1 of the user device 300, configures the forwarding priority corresponding to the address 10.0.10.1 of the user access device 200A to be 0, and configures the forwarding priority corresponding to the address 10.0.10.2 of the user access device 200B to be 1.
Thereafter, when the core network forwarding device 100 receives the downlink data addressed to 192.168.0.1, the address of the user access device with the highest forwarding priority corresponding to 192.168.0.1 is looked up in the reverse routing table. According to the query result, if the forwarding priority of the address 10.0.10.2 is the highest, the core network forwarding device 100 determines a corresponding TEID according to the address 10.0.10.2 and adds a corresponding GTPU tunnel header, then sends the downlink data packet to the user access device 200B corresponding to the address 10.0.10.2 according to the TEID, and then forwards the downlink data to the user device 300 by the user access device 200B.
Referring to fig. 5, this embodiment further provides a first data forwarding apparatus 510 applied to a core network forwarding device, where the core network forwarding device prestores a corresponding relationship between user equipment and user access equipment, where each user equipment is accessed to at least two user access devices. The first data forwarding device 510 may include a reverse routing relation module 511, an information receiving module 512, a status identification module 513, and a data sending module 514.
The reverse routing relation module 511 is configured to record a corresponding relation between the user equipment and the user access equipment, where each user equipment accesses at least two user access equipments.
The information receiving module 512 is configured to receive a primary state indication message sent by a user access device.
In this embodiment, the information receiving module 512 can be used to execute step S110 shown in fig. 2, and reference may be made to the description of step S110 for the detailed description of the information receiving module 512.
The state identification module 513 is configured to search for the target ue 300 corresponding to the ue that sends the active state indication message, and identify the ue that sends the active state indication message as the active ue of the target ue 300.
In this embodiment, the state identification module 513 may be configured to execute step S120 shown in fig. 2, and reference may be made to the description of step S120 for a detailed description of the state identification module 513.
The data sending module 514 is configured to receive downlink data that needs to be sent to the target user equipment 300, and send the downlink data to the active user access device of the target user equipment 300, so as to send the downlink data to the target user equipment 300 through the active user access device.
In this embodiment, the data sending module 514 may be configured to execute step S130 shown in fig. 2, and reference may be made to the description of step S130 for a detailed description of the data sending module 514.
In an example, the correspondence between the user equipment and the user access equipment is recorded in a reverse routing table of the core network forwarding device, and the reverse routing table records the correspondence between the user equipment and addresses of at least two user access devices accessed by the user equipment, and the forwarding priorities of the addresses of the at least two user access devices.
The state identification module 513 is specifically configured to search, according to the address of the user access device that sends the active state indication message, the address of the corresponding target user equipment 300 in the reverse routing table; and identifying the address of the user access equipment which sends the active state indication message as the active user access equipment with the highest forwarding priority in the addresses of at least two user access equipments corresponding to the address of the target user equipment 300.
The data sending module 514 is specifically configured to search for an address of the user access device with the highest forwarding priority corresponding to each target user device, and forward the downlink data to the corresponding user access device according to the searched address.
In one example, the core network forwarding device performs wireless communication based on LTE technology with the user access device through the base station, and the user access device performs wired communication based on IP protocol with the user device.
In one example, the core network forwarding device is a public data network gateway in the LTE core network.
Referring to fig. 6, fig. 6 is a schematic diagram of a hardware structure of a core network forwarding device 100 further provided in this embodiment. The core network forwarding device 100 may include a first processor 610 and a first machine-readable storage medium 620. The first processor 610 and the first machine-readable storage medium 620 may communicate via a system bus. Also, the first machine-readable storage medium 620 stores machine-executable instructions, and the first processor 610 may perform the data forwarding method shown in fig. 2 by reading and executing the machine-executable instructions in the first machine-readable storage medium 620.
Referring to fig. 7, the present embodiment further provides a second data forwarding apparatus 710 applied to a user access device, where the second data forwarding apparatus 710 may include a status detection module 711 and a status notification module 712.
The state detection module 711 is configured to detect a primary-standby relationship between the user access device 200 and other user access devices 200 in the same user area.
In this embodiment, the state detection module 711 can be used to execute step S210 shown in fig. 3, and the detailed description about the state detection module 711 can refer to the description about step S210.
The state notification module 712 is configured to send an active state indication message to the core network forwarding device 100 when the user access device 200 is an active user access device, so that the core network forwarding device 100 sends downlink data to the user access device when receiving the downlink data sent to the target user device 300 in the user area.
In this embodiment, the status notification module 712 can be used to execute step S220 shown in fig. 3, and the detailed description about the status notification module 712 can refer to the description about step S220.
In an example, the state notification module 712 is further configured to send an active state indication message to the core network forwarding device 100 at regular time, so that the core network forwarding device 100 records the active/standby state of the user access device 200.
Referring to fig. 8, fig. 8 is a schematic diagram of a hardware structure of a user access device 200 according to the present embodiment. The user access device 200 may include a second processor 810 and a second machine-readable storage medium 820. The second processor 810 and the second machine-readable storage medium 820 may communicate via a system bus. Also, the second machine-readable storage medium 820 stores machine-executable instructions, and the second processor 810 may perform the data forwarding method shown in fig. 3 by reading and executing the machine-executable instructions in the second machine-readable storage medium 820.
A machine-readable storage medium as referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: a RAM (random Access Memory), a volatile Memory, a non-volatile Memory, a flash Memory, a storage drive (e.g., a hard drive), a solid state drive, any type of storage disk (e.g., an optical disk, a dvd, etc.), or similar storage medium, or a combination thereof.
In summary, according to the data forwarding method, apparatus, and system provided in this embodiment of the present application, the primary user access device sends the primary state indication message to the core network forwarding device, so that the core network forwarding device can identify the primary user access device corresponding to the user equipment, and thus when forwarding downlink data, the core network forwarding device can correctly forward the downlink data to the primary user access device, and it is ensured that the downlink data can be smoothly sent to the user equipment.
The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A data forwarding method is applied to a core network forwarding device, the core network forwarding device wirelessly communicates with a user access device through a base station, the core network forwarding device prestores a corresponding relationship between the user devices and the user access devices, wherein each user device accesses at least two user access devices, the corresponding relationship between the user devices and the user access devices is recorded in a reverse routing table of the core network forwarding device, and the reverse routing table records an address corresponding relationship between the user devices and the at least two user access devices accessed by the user devices and forwarding priorities of addresses of the at least two user access devices, and the method includes:
receiving a main state indication message sent by user access equipment;
searching the address of the corresponding target user equipment in the reverse routing table according to the address of the user access equipment which sends the main state indication message;
identifying the address of the user access equipment which sends the main state indication message as the highest forwarding priority in the addresses of at least two user access equipment corresponding to the address of each target user equipment;
receiving downlink data sent to the target user equipment, searching for an address of a main user access device with the highest forwarding priority corresponding to the target user equipment, and forwarding the downlink data to the main user access device according to the searched address so as to send the downlink data to the target user equipment through the main user access device.
2. The method of claim 1, wherein the core network forwarding device performs lte-based wireless communication with a ue through a base station, and wherein the ue performs internet protocol-based wired communication with the ue.
3. The method of claim 2, wherein the core network forwarding device is a public data network gateway in an LTE core network.
4. A data forwarding method is characterized in that the method is applied to a data forwarding system comprising user access equipment and core network forwarding equipment, wherein the core network forwarding equipment prestores the corresponding relation between the user equipment and the user access equipment, and each user equipment is accessed to at least two user access equipment; the corresponding relation between the user equipment and the user access equipment is recorded in a reverse routing table of the core network forwarding equipment, and the reverse routing table records the address corresponding relation between the user equipment and at least two user access equipments accessed by the user equipment and the forwarding priorities of the addresses of the at least two user access equipments, and the method comprises the following steps:
the user access equipment detects the main-standby relationship between the user access equipment and other user access equipment in the same user area;
when the user access equipment detects that the equipment is the main user access equipment, the user access equipment sends a main state indication message to core network forwarding equipment;
the core network forwarding device searches the address of the corresponding target user equipment in the reverse routing table according to the address of the user access device which sends the main state indication message;
identifying the address of the user access equipment which sends the main state indication message as the highest forwarding priority in the addresses of at least two user access equipment corresponding to the address of each target user equipment;
the core network forwarding device receives the downlink data sent to the target user equipment, searches for an address of a master user access device with the highest forwarding priority corresponding to the target user equipment, and forwards the downlink data to the master user access device according to the searched address so as to send the downlink data to the target user equipment through the master user access device.
5. A data forwarding apparatus, applied to a core network forwarding device, where the core network forwarding device wirelessly communicates with a user access device through a base station, the apparatus comprising:
a reverse routing relation module, configured to record a corresponding relation between a user equipment and a user access device, where each user equipment accesses at least two user access devices, where the corresponding relation between the user equipment and the user access device is recorded in a reverse routing table of the core network forwarding device, and the reverse routing table records an address corresponding relation between the user equipment and at least two user access devices accessed by the user equipment and forwarding priorities of addresses of the at least two user access devices;
the information receiving module is used for receiving a main state indication message sent by the user access equipment;
a state identification module, configured to search, according to the address of the user access device that sends the master state indication message, the address of the corresponding target user device in the reverse routing table;
identifying the address of the user access equipment which sends the main state indication message as the highest forwarding priority in the addresses of at least two user access equipment corresponding to the address of each target user equipment;
a data sending module, configured to receive the downlink data sent to the target user equipment, search for an address of a primary user access device corresponding to the target user equipment and having a highest forwarding priority, and forward the downlink data to the primary user access device according to the searched address, so as to send the downlink data to the target user equipment through the primary user access device.
6. The apparatus of claim 5, wherein the core network forwarding device is in wireless communication with the user access device via a base station based on LTE technology.
7. The apparatus of claim 6, wherein the core network forwarding device is a public data network gateway in an LTE core network.
8. A data forwarding system is characterized in that the system comprises user access equipment and core network forwarding equipment, wherein the core network forwarding equipment prestores the corresponding relation between the user equipment and the user access equipment, each user equipment is accessed to at least two user access equipment, the corresponding relation between the user equipment and the user access equipment is recorded in a reverse routing table of the core network forwarding equipment, and the reverse routing table records the corresponding relation between the user equipment and the addresses of the at least two user access equipment accessed by the user equipment and the forwarding priority of the addresses of the at least two user access equipment;
the user access device is used for detecting the main-standby relationship between the user access device and other user access devices in the same user area, and sending a main state indication message to the core network forwarding device when detecting that the device is a main user access device;
the core network forwarding device is used for searching the address of the corresponding target user equipment in the reverse routing table according to the address of the user access device which sends the main state indication message;
identifying the address of the user access equipment which sends the main state indication message as the highest forwarding priority in the addresses of at least two user access equipment corresponding to the address of each target user equipment; receiving downlink data to be sent to the target user equipment, searching for an address of a master user access device corresponding to the target user equipment and having the highest forwarding priority, and forwarding the downlink data to the master user access device according to the searched address so as to send the downlink data to the target user equipment through the master user access device.
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